— of elevation, xxv, 123; xxxiii, 52.
— of wells and springs, xxxv, 379.
— — in New York, xxxvi, 25.
— —, xv, 190; xli, 316; xlix, 272.
— of the ocean, v, 129; xxv, 130.
— of the sea at great depths, from Péron's voyage, xvii, 295.
— —, ibid, remarks on, xviii, 191.
— —, table of Forster's observations, xvii, 299.
— —, table of Irving's observations, xvii, 299.
— —, —, xxiii, 10.